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Category:Numbers

A number is an abstract entity used to describe quantity. There are different types of numbers. The most familiar numbers are the natural numbers {0, 1, 2, ...} used for counting and denoted by N. If the negative whole numbers are included, one obtains the integers Z. Ratios of integers are called rational numbers or fractions; the set of all rational numbers is denoted by Q. If all infinite and non-repeating decimal expansions are included, one obtains the real numbers R. Those real numbers which are not rational are called irrational numbers. The real numbers are in turn extended to the complex numbers C in order to be able to solve all algebraic equations. The above symbols are often written in blackboard bold, thus:

$\mathbb{N}\sub\mathbb{Z}\sub\mathbb{Q}\sub\mathbb{R}\sub\mathbb{C}$

Subcategories

There are 12 subcategories to this category.

Cardinal numbers

Complex numbers

Constants

L

N

Number sequences

N cont.

R

Real numbers

Articles in category "Numbers"

There are 27 articles in this category.

Baker's dozen

C

D

F

Fraction (mathematics)

H

I

Ionian numerals

M

Mythical number

N

O

Octahedral number

P

P cont.

Preferred number

R

Round number

S

T

Categories: Mathematics

Last updated: 06-01-2005 23:03:56

Science Fair Project Encyclopedia Contents Page

10-26-2009 08:16:03
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